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EP0493752B1 - Process and apparatus for reinjecting hot dusts - Google Patents

Process and apparatus for reinjecting hot dusts Download PDF

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Publication number
EP0493752B1
EP0493752B1 EP19910121849 EP91121849A EP0493752B1 EP 0493752 B1 EP0493752 B1 EP 0493752B1 EP 19910121849 EP19910121849 EP 19910121849 EP 91121849 A EP91121849 A EP 91121849A EP 0493752 B1 EP0493752 B1 EP 0493752B1
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EP
European Patent Office
Prior art keywords
dust
hot
slide
melt
sluice
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19910121849
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German (de)
French (fr)
Other versions
EP0493752A1 (en
Inventor
Herbert Mayr
Rolf Dr. Hauk
Bodgan Dipl.-Ing. Vuletic
Werner Dr. Kepplinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Austria GmbH
Deutsche Voest Alpine Industrieanlagenbau GmbH
Original Assignee
Voest Alpine Industrienlagenbau GmbH
Deutsche Voest Alpine Industrieanlagenbau GmbH
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Publication of EP0493752A1 publication Critical patent/EP0493752A1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
    • C21B5/023—Injection of the additives into the melting part
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/22—Dust arresters
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C21B13/0026—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide in the flame of a burner or a hot gas stream
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a method and a device for recycling hot dusts.
  • Such returns of hot dusts are used in the production of molten pig iron or steel products from ferrous material or in the gasification of coal.
  • AT-PS 381 116 describes a method which, when using inferior coal, provides for additional heat supply by burning coal particles separated from the reducing gas.
  • burners are arranged in a ring shape on the melter gasifier in at least two superimposed horizontal planes.
  • the burners are connected to a dust storage container and to LPG lines.
  • the dust storage container is connected to a hot cyclone in which reducing raw gas is introduced and freed from solids, which mainly consist of coal particles.
  • US-A-3178165 shows a device for introducing coal in particle form into a blast furnace.
  • the coal is fed to a conveyor wheel via valves which are attached upstream or downstream of containers and is introduced from the latter into the blast furnace via a pressure line and nozzles.
  • the containers are connected to the high-pressure line part located in front of the blast furnace via a line system.
  • the pressure in the containers is adjusted as required in order to convey the coal from an area under higher pressure into an area under a lower pressure until the coal comes into the area of the feed wheel and from there it is brought into the blast furnace by its rotation and conveyed air becomes.
  • the pressure in the line in front of the blast furnace is higher than inside the furnace.
  • DE-B-21 41 898 describes a device with which particulate reducible metal ore is to be introduced into a reduction reactor solely under the action of gravity.
  • the ore is fed into a funnel located above the reactor and passes through the pressure funnel into the reactor. This is controlled with the valves located before and after a pressure funnel.
  • the invention is therefore based on the object of further developing and improving a method and a device of the type mentioned in the preamble of claims 1 and 2 in such a way that a recirculation of hot dusts is created which minimizes the signs of wear in the recirculation system.
  • This object is achieved according to the invention by a method and a device which includes a lock system and novel functional elements integrated therein, as a result of which backflow or suction of gas and dust is prevented and the dust supply is shut off.
  • the reduction raw gas produced in the melter gasifier is introduced into a hot gas cyclone and freed from the solids.
  • the dust which mainly consists of coke and iron particles, is separated.
  • the hot dust is transported from the hot gas cyclone to the burner via a lock system.
  • the lock system for overcoming the pressure difference between the hot gas cyclone and the melter gasifier consists of dust bunkers, hot dust valves and a cellular wheel sluice as a dosing device for the injector and the burner.
  • Knife gate valves are installed as shut-off devices for repair and maintenance purposes.
  • the hot dust is transported via the lock system from a zone of lower pressure in the hot gas cyclone to a zone of higher pressure at the burners arranged on the melter gasifier.
  • the airlock system prevents backflow or suction of gas and dust and enables the dust supply to be shut off.
  • the hot dust valves were preferably provided with water cooling and were designed by coating the sealing surfaces with hard or sintered metal so that on the one hand they seal securely and on the other hand they are abrasive Withstand the effect of the transported dust.
  • the hot gas cyclone is expediently designed as a welded construction made of sheet steel with a lining.
  • the dust bunkers are pressure vessels made of sheet metal with brick lining. Radioactive measuring probes are arranged in the dust bunkers to determine the level of the dust.
  • the hot dust slides are water-cooled via a milled labyrinth design for low-loss water flow of the cooling water through their housing and by direct cooling of the slide shaft.
  • the slide plate of the hot dust pusher is moved by means of pneumatic cylinders.
  • the slide shaft is supported with a ball seat and gland.
  • Slider plate and slideways for the slider plate are coated with hard or sintered metal.
  • the rotary valve has complete water cooling of the housing, rotor and rotary valve.
  • the rotor of the cellular wheel sluice is conical and has a welded armor made of high-temperature hard cobalt hard alloy. Furthermore, the rotor can be adjusted to ensure tightness.
  • the burners are arranged directly on the melter and gasify the hot dust using oxygen.
  • the burners are completely water-cooled.
  • the connecting pipe sections are equipped with heat-resistant inner pipes with ceramic cord sheathing.
  • the approximately 850 ° C hot dust 1a which consists mainly of coke and iron particles, is separated in the hot gas cyclone 1.
  • the hot gas cyclone 1 is a welded construction made of sheet steel with a lining.
  • the separated dust la is via a lock system 2a; 2 B; 3a; 3b; 3c; 4 transported to the burner 5.
  • the lock system for overcoming the pressure difference of approx. 5 KPa between the hot gas cyclone 1 and the burner 5 on the melter gasifier 7 consists of dust bunkers 2a and 2b, hot dust slide valves 3b, knife slide valves 3a and at least one rotary valve 4 and a ball valve 3c.
  • the hot dust is transported via the lock system 2a; 2 B; 3a; 3b; 3c; 4 from a zone of lower pressure in the hot gas cyclone 1 to a zone higher pressure to the burners 5 arranged on the melter gasifier 7.
  • the hot gas cyclone 1 is followed by a first knife slide 3a and a first hot dust slide 3b. Further knife slides 3a are located above and below the cellular wheel sluice 4 and immediately in front of the burner 5.
  • Knife gate valves 3a and ball valve 3c are open during normal operation and are only closed for maintenance and repair purposes.
  • the hot dust vanes 3b are installed above and below the dust hopper 2a.
  • they act as a sluice system which conveys the hot dust from a zone of lower pressure to a zone of higher pressure.
  • the structure of the hot dust pusher is explained below with reference to FIG. 2.
  • the hot dust reaches a first dust bunker 2a, then a second dust bunker 2b and from there into the cellular wheel sluice 4 via the knife slide 3a and the hot dust slide 3b.
  • the dust bunkers 2a and 2b are pressure vessels, which are designed as a sheet metal construction with brick lining.
  • the dust bunkers 2a and 2b contain radioactive measuring probes to determine and monitor the fill level.
  • the hot dust pushers 3b arranged above and below the dust bunkers 2a and 2b operate automatically.
  • the cellular wheel sluice 4 is installed between the injector 5a and the lower dust bunker 2b and acts as a metering element for the injector 5a and burner 5. It conveys the hot dust in a controlled manner to the injector 5a, which conveys the dust to the burners by means of propellant gas.
  • the cellular wheel sluice 4 fulfills the function of metered feeding of the injector conveyor system and also has a sealing function in the sluice system from bottom to top.
  • the cellular wheel sluice 4 has complete water cooling from the housing, rotor and cellular wheel with shaft.
  • the rotor is conical and welded with a heat-resistant cobalt hard alloy. The rotor can be adjusted to ensure permanent tightness.
  • the burners 5 are attached directly to the melter gasifier 7 and gasify the hot dust using oxygen. The burners 5 are completely water-cooled.
  • the connecting pipe pieces 6 between the above-described elements of the dust return such as hot gas cyclone 1, dust container 2a and 2b, knife slide valve 3a, hot dust slide valve 3b, cellular wheel sluice 4, injector 5a and burner 5, are heat-resistant Inner tubes equipped with ceramic cord sheathing.
  • Fig. 2 shows a sectional view through a hot dust pusher according to the invention.
  • the hot dust valve 3b is a gas-tight shut-off device which is moved up and down by means of pneumatic cylinders.
  • the hot dust slide 3b has a slide housing 8, which is provided with a milled labyrinth formation 9 for the purpose of water cooling and low-loss cooling water guidance.
  • the slide shaft 10 is also water-cooled.
  • the slide shaft 10 is supported via a ball seat 11 and a stuffing box 12.
  • the slide plate 13 is moved via pneumatic cylinders.
  • the slide plate 13 and the slideways 14 for the slide plate 13 are coated with hard or sintered metal against wear and to ensure gas tightness.
  • the inlet and outlet connections of the hot dust valve are equipped with inner tubes made of heat-resistant steel and ceramic cord sheathing.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cyclones (AREA)
  • Processing Of Solid Wastes (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Industrial Gases (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Disintegrating Or Milling (AREA)
  • Switches With Compound Operations (AREA)

Abstract

A process for recycling hot dust from a gasifier or melt-down gasifier by means of a hot gas cyclone separator integrated into a pipe system is described, together with the associated apparatus. The hot dust from the hot gas cyclone separator is supplied by means of a lock system to a burner in order to overcome the pressure difference between the hot gas cyclone separator and the melt-down gasifier. By means of the lock system the dust is supplied from a lower pressure zone to a higher pressure zone. The dust to be recycled comprises coke or a mixture of coke and iron particles.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Rückführung von heißen Stäuben.The invention relates to a method and a device for recycling hot dusts.

Derartige Rückführungen von heißen Stäuben finden bei der Herstellung von flüssigem Roheisen oder Stahlprodukten aus eisenhaltigem Material oder bei der Vergasung von Kohle Anwendung.Such returns of hot dusts are used in the production of molten pig iron or steel products from ferrous material or in the gasification of coal.

In der AT-PS 381 116 ist ein Verfahren beschrieben, welches bei Verwendung von minderwertiger Kohle eine zusätzliche Wärmezuführung durch Verbrennen von aus dem Reduktionsgas abgeschiedenen Kohleteilchen vorsieht.AT-PS 381 116 describes a method which, when using inferior coal, provides for additional heat supply by burning coal particles separated from the reducing gas.

Gemäß einer Vorrichtung zur Durchführung dieses Verfahrens sind am Einschmelzvergaser Brenner in mindestens zwei übereinanderliegenden horizontalen Ebenen kranzförmig angeordnet.According to a device for carrying out this method, burners are arranged in a ring shape on the melter gasifier in at least two superimposed horizontal planes.

Die Brenner sind mit einem Staubvorratsbehälter und mit Treibgasleitungen verbunden. Der Staubvorratsbehälter ist mit einem Heißzyklon verbunden, in welchem Reduktionsrohgas eingeleitet und von Feststoffen, die hauptsächlich aus Kohleteilchen bestehen, befreit wird.The burners are connected to a dust storage container and to LPG lines. The dust storage container is connected to a hot cyclone in which reducing raw gas is introduced and freed from solids, which mainly consist of coal particles.

Nachteilig an dieser Lösung ist, daß im Falle von Verstopfungen im Brennersystem ein Rückfluß von Gas in dem Bereich mit niedrigerem Druckniveau erfolgt, andererseits stets die Gefahr besteht, daß durch die Injektorwirkung Gas und Staub angesaugt wird.The disadvantage of this solution is that in the event of blockages in the burner system, gas reflows in the area with a lower pressure level, and on the other hand there is always the risk that gas and dust will be sucked in by the injector effect.

Da sich die Vorgänge auf einem Temperaturniveau von ca. 800° C abspielen und der Staub aufgrund seiner Konsistenz, insbesondere der Kokspartikel, eine stark abrasive Wirkung hat, sind Verschleißerscheinungen und dadurch bedingte Störungen im System nicht zu vermeiden.Since the processes take place at a temperature level of approx. 800 ° C and the dust, due to its consistency, especially the coke particles, has a strong abrasive effect, signs of wear and the resulting malfunctions in the system cannot be avoided.

Der US-A-3178165 ist eine Vorrichtung zum Einbringen von Kohle in Partikelform in einen Hochofen zu entnehmen. Bei dieser Vorrichtung wird die Kohle über Ventile, die vor oder nach Behältern angebracht sind, einem Förderrad zugeführt und von diesem über eine Druckleitung und Düsen in den Hochofen eingebracht. Hierbei sind die Behälter über ein Leitungssystem mit dem Hochdruckleitungsteil, der sich vor dem Hochofen befindet, verbunden. Über die Ventile wird der Druck in den Behältern je nach Bedarf eingestellt, um die Kohle von einem Bereich, der unter höherem Druck steht, in einen Bereich, der einen niedrigeren Druck aufweist, gefördert wird, bis die Kohle in den Bereich des Förderrades kommt und von dort durch dessen Drehung und geförderte Luft in den Hochofen eingebracht wird. Dabei ist der Druck in der Leitung vor dem Hochofen größer als im Inneren des Ofens.US-A-3178165 shows a device for introducing coal in particle form into a blast furnace. In the case of this device, the coal is fed to a conveyor wheel via valves which are attached upstream or downstream of containers and is introduced from the latter into the blast furnace via a pressure line and nozzles. Here, the containers are connected to the high-pressure line part located in front of the blast furnace via a line system. Via the valves, the pressure in the containers is adjusted as required in order to convey the coal from an area under higher pressure into an area under a lower pressure until the coal comes into the area of the feed wheel and from there it is brought into the blast furnace by its rotation and conveyed air becomes. The pressure in the line in front of the blast furnace is higher than inside the furnace.

In der DE-B-21 41 898 ist eine Vorrichtung beschrieben mit der teilchenförmiges reduzierbares Metallerz allein unter Schwerkraftwirkung in einen Reduktionsreaktor eingebracht werden soll. Das Erz wird in einen oberhalb des Reaktors angeordneten Trichter eingegeben und gelangt durch den Drucktrichter in den Reaktor. Gesteuert wird dies mit den Ventilen, die sich vor und nach einem Drucktrichter befinden.DE-B-21 41 898 describes a device with which particulate reducible metal ore is to be introduced into a reduction reactor solely under the action of gravity. The ore is fed into a funnel located above the reactor and passes through the pressure funnel into the reactor. This is controlled with the valves located before and after a pressure funnel.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung der im Oberbegriff des Anspruchs 1 und 2 genannten Art dahingehend weiterzuentwickeln und zu verbessern, daß eine Rückführung von Heißen Stäuben geschaffen wird, welche die Verschleißerscheinungen im Rückführungssystem minimiert.The invention is therefore based on the object of further developing and improving a method and a device of the type mentioned in the preamble of claims 1 and 2 in such a way that a recirculation of hot dusts is created which minimizes the signs of wear in the recirculation system.

Diese Aufgabe wird erfindungsgemäß durch ein Verfahren und eine Vorrichtung gelöst, welche ein Schleusensystem und hierin integriert neuartige Funktionselemente beinhaltet, wodurch ein Rückfluß bzw. eine Ansaugung von Gas und Staub verhindert und eine Absperrung der Staubzufuhr ermöglicht wird.This object is achieved according to the invention by a method and a device which includes a lock system and novel functional elements integrated therein, as a result of which backflow or suction of gas and dust is prevented and the dust supply is shut off.

Die Lösung dieser Aufgabe wird für das vorliegende Verfahren erfindungsgemäß durch die Merkmale des Anspruches 1, für die vorliegende Vorrichtung durch die Merkmale des Anspruches 2 im Zusammenhang mit den Unteransprüchen erreicht.This object is achieved for the present method by the features of claim 1, for the present device by the features of claim 2 in connection with the subclaims.

Das im Einschmelzvergaser anfallende Reduktionsrohgas wird in einen Heißgaszyklon eingeleitet und von den Feststoffen befreit. Der hauptsächlich aus Koks und Eisenpartikeln bestehende Staub wird abgeschieden.The reduction raw gas produced in the melter gasifier is introduced into a hot gas cyclone and freed from the solids. The dust, which mainly consists of coke and iron particles, is separated.

Aus dem Heißgaszyklon wird der heiße Staub über ein Schleusensystem zum Brenner transportiert. Das Schleusensystem zur Überwindung der Druckdifferenz zwischen Heißgaszyklon und Einschmelzvergaser besteht aus Staubbunkern, Heißstaubschiebern sowie einer Zellenradschleuse als Dosierorgan zum Injektor und dem Brenner.The hot dust is transported from the hot gas cyclone to the burner via a lock system. The lock system for overcoming the pressure difference between the hot gas cyclone and the melter gasifier consists of dust bunkers, hot dust valves and a cellular wheel sluice as a dosing device for the injector and the burner.

Für Reparatur- und Wartungszwecke sind Messerschieber als Absperrorgane installiert. Die Beförderung des heißen Staubes erfolgt über das Schleusensystem von einer Zone niedrigeren Druckes im Heißgaszyklon zu einer Zone höheren Druckes an den am Einschmelzvergaser angeordneten Brennern. Das Schleusensystem verhindert einen Rückfluß bzw. eine Ansaugung von Gas und Staub und ermöglicht die Absperrung der Staubzufuhr. Aufgrund der hohen Temperaturen und der Druckdifferenz zwischen dem Heißgaszyklon und den Brennern am Einschmelzvergaser wurden die Heißstaubschieber bevorzugt mit einer Wasserkühlung versehen und durch eine Beschichtung der Dichtflächen mit Hart- oder Sintermetall so ausgebildet, daß sie einerseits sicher abdichten und andererseits der abrasiven Wirkung der beförderten Stäube standhalten. Der Heißgaszyklon ist zweckmäßigerweise als Schweißkonstruktion aus Stahlblech mit Ausmauerung ausgebildet.Knife gate valves are installed as shut-off devices for repair and maintenance purposes. The hot dust is transported via the lock system from a zone of lower pressure in the hot gas cyclone to a zone of higher pressure at the burners arranged on the melter gasifier. The airlock system prevents backflow or suction of gas and dust and enables the dust supply to be shut off. Due to the high temperatures and the pressure difference between the hot gas cyclone and the burners on the melter gasifier, the hot dust valves were preferably provided with water cooling and were designed by coating the sealing surfaces with hard or sintered metal so that on the one hand they seal securely and on the other hand they are abrasive Withstand the effect of the transported dust. The hot gas cyclone is expediently designed as a welded construction made of sheet steel with a lining.

Die Staubbunker sind Druckbehälter aus Blech mit Ausmauerung. In den Staubbunkern sind zur Ermittlung der Füllstandshöhe des Staubes radioaktive Meßsonden angeordnet.The dust bunkers are pressure vessels made of sheet metal with brick lining. Radioactive measuring probes are arranged in the dust bunkers to determine the level of the dust.

Die Heißstaubschieber sind über eine gefräste Labyrinth-Ausbildung zur verlustarmen Wasserführung des Kühlwassers über ihr Gehäuse sowie durch unmittelbare Kühlung der Schieberwelle wassergekühlt.The hot dust slides are water-cooled via a milled labyrinth design for low-loss water flow of the cooling water through their housing and by direct cooling of the slide shaft.

Der Schieberteller der Heißstaubschieber wird mittels pneumatischer Zylinder bewegt. Die Schieberwelle ist mit Kugelsitz und Stopfbuchse gelagert. Schieberteller und Gleitbahnen für den Schieberteller sind mit Hart- oder Sintermetall beschichtet.The slide plate of the hot dust pusher is moved by means of pneumatic cylinders. The slide shaft is supported with a ball seat and gland. Slider plate and slideways for the slider plate are coated with hard or sintered metal.

Die Zellenradschleuse weist eine komplette Wasserkühlung von Gehäuse, Rotor und Zellenrad auf. Der Rotor der Zellenradschleuse ist konisch ausgebildet und weist eine Schweißpanzerung aus hochwarmfester Kobalt-Hartlegierung auf. Weiterhin ist der Rotor zur Gewährleistung der Dichtigkeit nachstellbar.The rotary valve has complete water cooling of the housing, rotor and rotary valve. The rotor of the cellular wheel sluice is conical and has a welded armor made of high-temperature hard cobalt hard alloy. Furthermore, the rotor can be adjusted to ensure tightness.

Die Brenner sind direkt am Einschmelzvergaser angeordnet und vergasen den heißen Staub mittels Sauerstoff. Die Brenner sind komplett wassergekühlt.The burners are arranged directly on the melter and gasify the hot dust using oxygen. The burners are completely water-cooled.

Die verbindenden Rohrstücke sind mit hitzbeständigen Innenrohren mit Keramikschnurummantelung ausgestattet.The connecting pipe sections are equipped with heat-resistant inner pipes with ceramic cord sheathing.

Im Normalbetrieb der Rückführung der heißen Stäube sind die Messerschieber und der Kugelhahn geöffnet. Sie werden lediglich zu Zwecken der Wartung oder im Reparaturfall geschlossen.In normal operation of the return of the hot dusts, the knife slides and the ball valve are open. They are only closed for maintenance or repair purposes.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles erläutert. Es zeigen:

Fig. 1
ein Schema der erfindungsgemäßen Staubrückführung mit Schleusensystem, und
Fig. 2
eine Schnittdarstellung durch einen erfindungsgemäßen Heißstaubschieber.
The invention is explained below using an exemplary embodiment. Show it:
Fig. 1
a diagram of the dust recirculation according to the invention with lock system, and
Fig. 2
a sectional view through a hot dust pusher according to the invention.

Wie in Fig. 1 dargestellt, wird der ca. 850°C heiße Staub 1a, welcher hauptsächlich aus Koks- und Eisenpartikeln besteht, in dem Heißgaszyklon 1 abgeschieden.As shown in Fig. 1, the approximately 850 ° C hot dust 1a, which consists mainly of coke and iron particles, is separated in the hot gas cyclone 1.

Der Heißgaszyklon 1 ist eine Schweißkonstruktion aus Stahlblech mit Ausmauerung.The hot gas cyclone 1 is a welded construction made of sheet steel with a lining.

Der abgeschiedene Staub la wird über ein Schleusensystem 2a; 2b; 3a; 3b; 3c; 4 zum Brenner 5 transportiert. Das Schleusensystem zur Überwindung der Druckdifferenz von ca. 5 KPa zwischen Heißgaszyklon 1 und Brenner 5 am Einschmelzvergaser 7 besteht aus Staubbunkern 2a und 2b, Heißstaubschiebern 3b, Messerschiebern 3a sowie wenigstens einer Zellenradschleuse 4 und einem Kugelhahn 3c.The separated dust la is via a lock system 2a; 2 B; 3a; 3b; 3c; 4 transported to the burner 5. The lock system for overcoming the pressure difference of approx. 5 KPa between the hot gas cyclone 1 and the burner 5 on the melter gasifier 7 consists of dust bunkers 2a and 2b, hot dust slide valves 3b, knife slide valves 3a and at least one rotary valve 4 and a ball valve 3c.

Die Beförderung des heißen Staubes erfolgt über das Schleusensystem 2a; 2b; 3a; 3b; 3c; 4 von einer Zone niedrigeren Druckes im Heißgaszyklon 1 zu einer Zone höheren Druckes an die am Einschmelzvergaser 7 angeordneten Brenner 5.The hot dust is transported via the lock system 2a; 2 B; 3a; 3b; 3c; 4 from a zone of lower pressure in the hot gas cyclone 1 to a zone higher pressure to the burners 5 arranged on the melter gasifier 7.

Dem Heißgaszyklon 1 ist ein erster Messerschieber 3a sowie ein erster Heißstaubschieber 3b nachgeordnet. Weitere Messerschieber 3a befinden sich oberhalb und unterhalb der Zellenradschleuse 4 und unmittelbar vor dem Brenner 5.The hot gas cyclone 1 is followed by a first knife slide 3a and a first hot dust slide 3b. Further knife slides 3a are located above and below the cellular wheel sluice 4 and immediately in front of the burner 5.

Die Messerschieber 3a und der Kugelhahn 3c sind im Normalbetrieb geöffnet und werden nur zu Wartungs- bzw. Reparaturzwecken geschlossen. Die Heißstaubschieber 3b sind oberhalb und unterhalb des Staubbunkers 2a installiert. Im Zusammenwirken mit den Staubbunkern 2a und 2b und der Zellenradschleuse 4 wirken sie als Schleusensystem, welches den heißen Staub von einer Zone niedrigeren Druckes zu einer Zone höheren Druckes befördert. Der Aufbau des Heißstaubschiebers wird im weiteren anhand von Fig. 2 erläutert.Knife gate valves 3a and ball valve 3c are open during normal operation and are only closed for maintenance and repair purposes. The hot dust vanes 3b are installed above and below the dust hopper 2a. In cooperation with the dust bunkers 2a and 2b and the cellular wheel sluice 4, they act as a sluice system which conveys the hot dust from a zone of lower pressure to a zone of higher pressure. The structure of the hot dust pusher is explained below with reference to FIG. 2.

Über den Messerschieber 3a und den Heißstaubschieber 3b gelangt der heiße Staub in einen ersten Staubbunker 2a, danach in einen zweiten Staubbunker 2b und von dort in die Zellenradschleuse 4.The hot dust reaches a first dust bunker 2a, then a second dust bunker 2b and from there into the cellular wheel sluice 4 via the knife slide 3a and the hot dust slide 3b.

Die Staubbunker 2a und 2b sind Druckbehälter, welche als Blechkonstruktion mit Ausmauerung ausgeführt sind. Zur Ermittlung und Überwachung des Füllstandes enthalten die Staubbunker 2a und 2b radioaktive Meßsonden. Die oberhalb und unterhalb der Staubbunker 2a und 2b angeordneten Heißstaubschieber 3b operieren automatisch.The dust bunkers 2a and 2b are pressure vessels, which are designed as a sheet metal construction with brick lining. The dust bunkers 2a and 2b contain radioactive measuring probes to determine and monitor the fill level. The hot dust pushers 3b arranged above and below the dust bunkers 2a and 2b operate automatically.

Die Zellenradschleuse 4 ist zwischen Injektor 5a und unterem Staubbunker 2b installiert und wirkt als Dosierorgan zum Injektor 5a und Brenner 5. Sie fördert den heißen Staub geregelt zum Injektor 5a, welcher den Staub mittels Treibgas zu den Brennern befördert.The cellular wheel sluice 4 is installed between the injector 5a and the lower dust bunker 2b and acts as a metering element for the injector 5a and burner 5. It conveys the hot dust in a controlled manner to the injector 5a, which conveys the dust to the burners by means of propellant gas.

Die Zellenradschleuse 4 erfüllt die Funktion der dosierten Einspeisung des Injektorfördersystems und hat zudem noch eine Abdichtfunktion im Schleusensystem von unten nach oben. Die Zellenradschleuse 4 weist eine komplette Wasserkühlung vom Gehäuse, Rotor und Zellenrad mit Welle auf. Der Rotor ist konisch ausgebildet und mit einer Schweißpanzerung aus einer hochwarmfesten Kobalt-Hartlegierung versehen. Zur dauerhaften Gewährleistung der Dichtigkeit ist der Rotor nachstellbar. Die Brenner 5 sind direkt am Einschmelzgasvergaser 7 angebracht und vergasen den heißen Staub mittels Sauerstoff. Die Brenner 5 sind komplett wassergekühlt.The cellular wheel sluice 4 fulfills the function of metered feeding of the injector conveyor system and also has a sealing function in the sluice system from bottom to top. The cellular wheel sluice 4 has complete water cooling from the housing, rotor and cellular wheel with shaft. The rotor is conical and welded with a heat-resistant cobalt hard alloy. The rotor can be adjusted to ensure permanent tightness. The burners 5 are attached directly to the melter gasifier 7 and gasify the hot dust using oxygen. The burners 5 are completely water-cooled.

Aus Gründen der Wärmeisolierung und der Verminderung von Spannungen durch Temperaturwechselbeanspruchung sind die verbindenden Rohrstücke 6 zwischen den oben beschriebenen Elementen der Staubrückführung, wie Heißgaszyklon 1, Staubbehälter 2a und 2b, Messerschieber 3a, Heißstaubschieber 3b, Zellenradschleuse 4, Injektor 5a und Brenner 5, mit hitzebeständigen Innenrohren mit Keramikschnurummantelung ausgestattet.For reasons of thermal insulation and the reduction of stresses due to temperature changes, the connecting pipe pieces 6 between the above-described elements of the dust return, such as hot gas cyclone 1, dust container 2a and 2b, knife slide valve 3a, hot dust slide valve 3b, cellular wheel sluice 4, injector 5a and burner 5, are heat-resistant Inner tubes equipped with ceramic cord sheathing.

Fig. 2 zeigt eine Schnittdarstellung durch einen erfindungsgemäßen Heißstaubschieber.Fig. 2 shows a sectional view through a hot dust pusher according to the invention.

Der Heißstaubschieber 3b ist ein gasdichtes Absperrorgan, welches mittels pneumatischer Zylinder auf und zu bewegt wird. Der Heißstaubschieber 3b besitzt ein Schiebergehäuse 8, welches zum Zwecke der Wasserkühlung und einer verlustarmen Kühlwasserführung mit einer gefrästen Labyrinth-Ausbildung 9 versehen ist. Die Schieberwelle 10 wird ebenfalls wassergekühlt. Die Lagerung der Schieberwelle 10 erfolgt über Kugelsitz 11 und Stopfbuchse 12. Die Bewegung des Schiebertellers 13 erfolgt über pneumatische Zylinder. Der Schieberteller 13 und die Gleitbahnen 14 für den Schieberteller 13 sind gegen Verschleiß und für die Gewährleistung der Gasdichtheit mit Hart- oder Sintermetall beschichtet. Die Zu- und Ablaufstutzen der Heißstaubschieber sind mit Innenrohren aus hitzebeständigem Stahl und Keramikschnurummantelung versehen.The hot dust valve 3b is a gas-tight shut-off device which is moved up and down by means of pneumatic cylinders. The hot dust slide 3b has a slide housing 8, which is provided with a milled labyrinth formation 9 for the purpose of water cooling and low-loss cooling water guidance. The slide shaft 10 is also water-cooled. The slide shaft 10 is supported via a ball seat 11 and a stuffing box 12. The slide plate 13 is moved via pneumatic cylinders. The slide plate 13 and the slideways 14 for the slide plate 13 are coated with hard or sintered metal against wear and to ensure gas tightness. The inlet and outlet connections of the hot dust valve are equipped with inner tubes made of heat-resistant steel and ceramic cord sheathing.

Claims (15)

  1. Method for the recycling of hot dusts from a gasifier or melt-down gasifier by way of a hot cyclone and dust bunkers, which are integrated into a pipeline system, characterized in that the hot dust (1a) from the hot-gas cyclone (1), which is a zone of lower pressure, is fed by way a sluice system (2a; 2b; 3a; 3b; 4) to the melt-down gasifier (7) by means of an injector (5a) by way of burners (5) so as to overcome the pressure difference relative to the melt-down gasifier (7), the sluice system having in succession an upper dust bunker (2a) and a lower dust bunker (2b) and a cellular-wheel sluice (4), which can be separated from one another by means of slides (3a, 3b).
  2. Apparatus for the recycling of hot dusts from a melt-down gasifier by way of a hot cyclone and dust bunkers, which are integrated into a pipeline system, characterized in that there is provided between the hot-gas cyclone (1) and a burner (5) located at the melt-down gasifier (7) a sluice system which has in succession an upper dust bunker (2a), a lower dust bunker (2b) and a cellular-wheel sluice (4), slides (3a, 3b) being arranged therebetween.
  3. Apparatus according to Claim 2, characterized in that the hot-gas cyclone (1) is designed as a welded structure made from sheet steel with a brick lining.
  4. Apparatus according to Claim 2, characterized in that the upper dust bunker (2a) and the lower dust bunker (2b) are designed as pressure vessels, the pressure vessel being formed from a sheet-metal structure with a brick lining.
  5. Apparatus according to Claim 4, characterized in that radioactive measuring probes for determining the filling level of the dust (1a) are arranged in the dust bunkers (2a; 2b).
  6. Apparatus according to Claim 2, characterized in that the hot-dust slide (3b) has a slide housing (8) with a milled labyrinth design (9) for the low-loss water conveyance of the cooling water.
  7. Apparatus according to Claim 2 and 6, characterized in that the hot-dust slide (3b) has a water-cooled slide shaft (10) and the slide plate (13) is moved by means of pneumatic cylinders.
  8. Apparatus according to Claim 2, characterized in that the hot-dust slide (3b) has a slide shaft (10) which is mounted by means of a ball seat (11) and a gland (12).
  9. Apparatus according to Claim 2, characterized in that the hot-dust slide (3b) has a slide plate (13) and slideways (14) for the slide plate (13), the slide plate (13) and the slideways (14) being coated with hard or sintered metal.
  10. Apparatus according to Claim 2 and 6, characterized in that the inflow and outflow connection pieces of the hot-dust slide (3b) are provided with inner tubes made of heat-resistant steel with ceramic-cord sheathing.
  11. Apparatus according to Claim 2, characterized in that the cellular-wheel sluice (4) has complete water cooling of the housing, rotor and cellular wheel with shaft.
  12. Apparatus according to Claim 11, characterized in that the rotor is designed conically and is provided with welded armouring made from a high-temperature hard cobalt alloy.
  13. Apparatus according to Claim 11 and 12, characterized in that the rotor can be readjusted in order to maintain leakproofing.
  14. Apparatus according to Claim 2, characterized in that the burners (5) are fully water-cooled.
  15. Apparatus according to Claim 2, characterized in that the connecting pipe segments (6) having heat-resistant inner tubes are equipped with ceramic-cord sheathing.
EP19910121849 1990-12-27 1991-12-19 Process and apparatus for reinjecting hot dusts Expired - Lifetime EP0493752B1 (en)

Applications Claiming Priority (2)

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DE19904041936 DE4041936C1 (en) 1990-12-27 1990-12-27
DE4041936 1990-12-27

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EP0493752A1 EP0493752A1 (en) 1992-07-08
EP0493752B1 true EP0493752B1 (en) 1996-07-10

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US (1) US5259594A (en)
EP (1) EP0493752B1 (en)
JP (1) JPH0686597B2 (en)
KR (1) KR100220171B1 (en)
AT (1) ATE140269T1 (en)
AU (1) AU651855B2 (en)
BR (1) BR9105576A (en)
CA (1) CA2058520C (en)
DE (2) DE4041936C1 (en)
ES (1) ES2089103T3 (en)
ZA (1) ZA919927B (en)

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AT403168B (en) * 1995-11-02 1997-11-25 Voest Alpine Ind Anlagen METHOD AND DEVICE FOR RETURNING A FINE-PARTICLE SOLID EXHAUSTED FROM A REACTOR VESSEL WITH A GAS
DE19638346C1 (en) * 1996-09-19 1998-02-12 Voest Alpine Ind Anlagen Method for monitoring the operation of a device for supplying an abrasive medium with the aid of a fluid
ATA166096A (en) * 1996-09-19 1999-02-15 Voest Alpine Ind Anlagen DEVICE FOR SEALING THE INTERMEDIATE BUNKERS OF THE DUST RECOVERY OF THE GENERATOR GAS
AT404022B (en) 1996-11-08 1998-07-27 Voest Alpine Ind Anlagen METHOD AND INSTALLATION FOR THE PRODUCTION OF LIQUID PIPE IRON OR STEEL PRE-PRODUCTS FROM IRON-CONTAINING MATERIAL
US6552355B1 (en) 1997-06-06 2003-04-22 Texaco, Inc. Optical detection of entrapped gas in a cooling system
DE20209161U1 (en) * 2002-06-12 2003-10-23 Georg Springmann Industrie- und Bergbautechnik GmbH, 45472 Mülheim Pipe system for fuel injection in blast furnaces or the like.
US8155858B2 (en) * 2008-04-01 2012-04-10 Cummins Filtration Ip, Inc. Real-time doser efficiency monitoring

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DE947713C (en) * 1952-06-26 1956-08-23 Mannesmann Huettenwerke Ag Dui Quantity measurement of aggregates for metallurgical processes
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US3178165A (en) * 1963-03-21 1965-04-13 Koppers Co Inc Apparatus for injecting solid particulate material into a metallurgical furnace
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LU79611A1 (en) * 1978-05-08 1979-12-06 Sidmar Nv DUST EXTRACTION DEVICE
AT381116B (en) * 1984-11-15 1986-08-25 Voest Alpine Ag METHOD FOR THE PRODUCTION OF LIQUID PIPE IRON OR STEEL PRE-PRODUCTS AND DEVICE FOR IMPLEMENTING THE METHOD
JPH0635588B2 (en) * 1985-03-25 1994-05-11 三菱重工業株式会社 Coal gasifier
JPS61231323A (en) * 1985-04-05 1986-10-15 Kawasaki Heavy Ind Ltd Device for feeding predetermined quantity of pulverized body
AT390622B (en) * 1988-10-25 1990-06-11 Voest Alpine Ind Anlagen METHOD AND INSTALLATION FOR THE PRODUCTION OF LIQUID PIG IRON

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DE59107993D1 (en) 1996-08-14
KR920012461A (en) 1992-07-27
US5259594A (en) 1993-11-09
CA2058520A1 (en) 1992-06-28
ATE140269T1 (en) 1996-07-15
AU9001291A (en) 1992-07-02
ES2089103T3 (en) 1996-10-01
EP0493752A1 (en) 1992-07-08
ZA919927B (en) 1992-09-30
JPH0686597B2 (en) 1994-11-02
BR9105576A (en) 1992-09-29
DE4041936C1 (en) 1992-09-24
KR100220171B1 (en) 1999-09-01
JPH04335090A (en) 1992-11-24
AU651855B2 (en) 1994-08-04
CA2058520C (en) 1997-06-24

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